90434561729 has 4 divisors (see below), whose sum is σ = 90435739584. Its totient is φ = 90433383876.

The previous prime is 90434561699. The next prime is 90434561731. The reversal of 90434561729 is 92716543409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90434561729 - 2⁸ = 90434561473 is a prime.

It is a super-2 number, since 2×90434561729² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90434561929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465077 + ... + 630210.

It is an arithmetic number, because the mean of its divisors is an integer number (22608934896).

Almost surely, 2^90434561729 is an apocalyptic number.

It is an amenable number.

90434561729 is a deficient number, since it is larger than the sum of its proper divisors (1177855).

90434561729 is a wasteful number, since it uses less digits than its factorization.

90434561729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177854.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 90434561729 in words is "ninety billion, four hundred thirty-four million, five hundred sixty-one thousand, seven hundred twenty-nine".